diff options
Diffstat (limited to 'drivers/iio/common/st_sensors/st_sensors_trigger.c')
-rw-r--r-- | drivers/iio/common/st_sensors/st_sensors_trigger.c | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/drivers/iio/common/st_sensors/st_sensors_trigger.c b/drivers/iio/common/st_sensors/st_sensors_trigger.c new file mode 100644 index 0000000..139ed03 --- /dev/null +++ b/drivers/iio/common/st_sensors/st_sensors_trigger.c @@ -0,0 +1,77 @@ +/* + * STMicroelectronics sensors trigger library driver + * + * Copyright 2012-2013 STMicroelectronics Inc. + * + * Denis Ciocca <denis.ciocca@st.com> + * + * Licensed under the GPL-2. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/iio/iio.h> +#include <linux/iio/trigger.h> +#include <linux/interrupt.h> + +#include <linux/iio/common/st_sensors.h> + + +int st_sensors_allocate_trigger(struct iio_dev *indio_dev, + const struct iio_trigger_ops *trigger_ops) +{ + int err; + struct st_sensor_data *sdata = iio_priv(indio_dev); + + sdata->trig = iio_trigger_alloc("%s-trigger", indio_dev->name); + if (sdata->trig == NULL) { + err = -ENOMEM; + dev_err(&indio_dev->dev, "failed to allocate iio trigger.\n"); + goto iio_trigger_alloc_error; + } + + err = request_threaded_irq(sdata->get_irq_data_ready(indio_dev), + iio_trigger_generic_data_rdy_poll, + NULL, + IRQF_TRIGGER_RISING, + sdata->trig->name, + sdata->trig); + if (err) + goto request_irq_error; + + sdata->trig->private_data = indio_dev; + sdata->trig->ops = trigger_ops; + sdata->trig->dev.parent = sdata->dev; + + err = iio_trigger_register(sdata->trig); + if (err < 0) { + dev_err(&indio_dev->dev, "failed to register iio trigger.\n"); + goto iio_trigger_register_error; + } + indio_dev->trig = sdata->trig; + + return 0; + +iio_trigger_register_error: + free_irq(sdata->get_irq_data_ready(indio_dev), sdata->trig); +request_irq_error: + iio_trigger_free(sdata->trig); +iio_trigger_alloc_error: + return err; +} +EXPORT_SYMBOL(st_sensors_allocate_trigger); + +void st_sensors_deallocate_trigger(struct iio_dev *indio_dev) +{ + struct st_sensor_data *sdata = iio_priv(indio_dev); + + iio_trigger_unregister(sdata->trig); + free_irq(sdata->get_irq_data_ready(indio_dev), sdata->trig); + iio_trigger_free(sdata->trig); +} +EXPORT_SYMBOL(st_sensors_deallocate_trigger); + +MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); +MODULE_DESCRIPTION("STMicroelectronics ST-sensors trigger"); +MODULE_LICENSE("GPL v2"); |